Compare 4 scientific formulas to find your healthy weight range
Ideal Weight Calculator is a free health and wellness calculator that helps you compare 4 scientific formulas to find your healthy weight range. Understanding your body's metrics is the first step toward making informed health decisions. This tool uses clinically recognized formulas to provide instant, accurate estimates — though always consult a healthcare professional for medical advice.
No single formula is best for everyone — each was developed on different populations. Devine (1974) is widely used in clinical settings (especially for medication dosing). Hamwi (1964) is common in dietetics. Robinson and Miller were developed in 1983. Using the average of all four gives a more balanced estimate for general use.
BMI (Body Mass Index) gives a range of healthy weights for a given height (typically 18.5–24.9 kg/m²). Ideal weight formulas give a single target number. Neither accounts for muscle mass, bone density, or body composition. A muscular athlete may have a "high" BMI but excellent health. Use these as rough guides, not strict targets.
Rather than a single number, a healthy weight range is typically considered to be BMI 18.5–24.9 for adults. However, body composition matters more than scale weight. Two people with the same BMI can have very different health outcomes depending on their muscle-to-fat ratio. Focus on habits over a target number.